Heterogeneous olefin polymerization catalysts have received wide interests from academia and industry because their distinct advantages in thermostability, avoidance of reactor fouling and continuous production operations. In this work, hydroxy functional groups are introduced to the α-diimine nickel framework, which can serve as reactive functionality to react with MgCl/AlR(OEt) and form ionic anchoring interaction that bind the catalyst strongly to the surface of the supports. These heterogeneous catalysts are highly active in ethylene polymerization to produce polyethylene with higher molecular weight (up to 280.5 × 10 g·mol), lower branching density and higher tensile strength (up to 26.7 MPa) than those generated by the homogeneous counterparts. More importantly, the nickel complexes with multiple hydroxy groups lead to high loading capacity on MgCl/AlR(OEt) supports, affording polyethylene products with minimum inorganic contamination.

中文翻译：

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含羟基α-二亚胺镍配合物催化乙烯均聚和杂聚

多相烯烃聚合催化剂因其在热稳定性、避免反应器结垢和连续生产操作等方面的独特优势而受到学术界和工业界的广泛关注。在这项工作中，羟基官能团被引入到α-二亚胺镍骨架中，它可以作为反应官能团与MgCl/AlR(OEt)反应并形成离子锚定相互作用，将催化剂牢固地结合到载体表面。这些非均相催化剂在乙烯聚合中具有很高的活性，可生产比均相催化剂具有更高分子量（高达 280.5 × 10 g·mol）、更低支化密度和更高拉伸强度（高达 26.7 MPa）的聚乙烯。更重要的是，具有多个羟基的镍络合物在 MgCl/AlR(OEt) 载体上具有高负载能力，从而使聚乙烯产品具有最小的无机污染。